CN116865714B - Filter for N79 frequency band - Google Patents
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- CN116865714B CN116865714B CN202311137884.0A CN202311137884A CN116865714B CN 116865714 B CN116865714 B CN 116865714B CN 202311137884 A CN202311137884 A CN 202311137884A CN 116865714 B CN116865714 B CN 116865714B
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- 230000010355 oscillation Effects 0.000 claims description 13
- 230000001629 suppression Effects 0.000 claims description 10
- 235000019687 Lamb Nutrition 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000010409 thin film Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 12
- 238000012545 processing Methods 0.000 abstract description 5
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- 239000004065 semiconductor Substances 0.000 abstract description 4
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
- H03H9/56—Monolithic crystal filters
- H03H9/566—Electric coupling means therefor
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
- H03H9/58—Multiple crystal filters
- H03H9/60—Electric coupling means therefor
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6423—Means for obtaining a particular transfer characteristic
- H03H9/6433—Coupled resonator filters
- H03H9/644—Coupled resonator filters having two acoustic tracks
- H03H9/6456—Coupled resonator filters having two acoustic tracks being electrically coupled
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Abstract
The invention provides a filter for an N79 frequency band, which comprises: at least one acoustic resonator and an IPD filter circuit; the acoustic resonator and the IPD filter circuit are sequentially connected in series, or the acoustic resonator and the IPD filter circuit are connected in series at intervals; the IPD filter circuit is used for forming a passband in an N79 frequency band. The filter for the N79 frequency band adopts an acoustic resonator and IPD filter circuit integration technology to realize target requirements, and adopts a semiconductor processing technology to realize processing and manufacturing on the same wafer, and the circuit and the structure of the filter can have the characteristics of large bandwidth and quick roll-off, and can simultaneously realize low insertion loss of the N79 frequency band and high inhibition of WiFi 6E.
Description
Technical Field
The invention relates to the technical field of semiconductor devices, in particular to a filter for an N79 frequency band, and particularly relates to a filter for the N79 frequency band, which is coexistent with WiFi 6E.
Background
The fifth generation cellular technology (5G) can increase the speed, reduce the delay and enhance the flexibility for wireless services, and the 5G communication technology is the subject of the important research of the current technological industry.
As the communication frequency bands are continuously expanding and becoming more dense, a great deal of crosstalk is generated between adjacent frequency bands, for example, the N79 frequency band (4.4 GHz-5 GHz) in 5G is very close to the 5GHz frequency band (5.17 GHz-5.835 GHz) in WiFi 6E, and then the filter for the N79 frequency band needs to have a high suppression degree in the range of 5.17GHz-5.835GHz at the same time.
The filter for the N79 band needs to have a large bandwidth of 600MHz, and needs to reach a high suppression degree only at the frequency point of 170MHz on the right side of the passband. Currently, a passive integrated device (Integrated Passive Devices, abbreviated as IPD) technology or a low-temperature co-fired Ceramic (Low Temperature Co-fired Ceramic, abbreviated as LTCC) technology is mainly adopted in the industry to manufacture a filter for the N79 frequency band, and both the filter and the filter form the filter by using a thin film inductor and a capacitor, so that the performance requirements of high frequency and large bandwidth can be realized.
However, these techniques currently have the limitation that the roll-off from passband to stopband is very slow and it is difficult to create a high degree of rejection at 5.17 GHz.
Disclosure of Invention
In view of the above, the present invention provides a filter for N79 frequency band, which has the following technical scheme:
a filter for an N79 frequency band, the filter comprising: at least one acoustic resonator and an IPD filter circuit;
the acoustic resonator and the IPD filter circuit are sequentially connected in series, or the acoustic resonator and the IPD filter circuit are connected in series at intervals;
the IPD filter circuit is used for forming a passband in an N79 frequency band.
Preferably, in the above filter, the acoustic resonator includes: surface wave resonators, bulk acoustic wave resonators, thin film bulk acoustic wave resonators, solid mount resonators or lamb wave resonators.
Preferably, in the above filter, the acoustic resonator includes a first acoustic resonator and a second acoustic resonator, a first end of the first acoustic resonator is used as an input end of the filter, and a second end of the first acoustic resonator is connected to the first end of the second acoustic resonator;
the IPD filter circuit includes: the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the first oscillating circuit, the second oscillating circuit, the third oscillating circuit, the fourth oscillating circuit and the fifth oscillating circuit;
the second end of the second acoustic resonator is respectively connected with the first end of the first capacitor and the first end of the first oscillation circuit;
the second end of the first capacitor is connected with the first end of the second capacitor, and the connecting node is connected with the first end of the second oscillating circuit;
the second end of the second capacitor is connected with the first end of the third oscillating circuit;
the second end of the third oscillating circuit is respectively connected with the first end of the third capacitor and the first end of the fourth oscillating circuit;
the second end of the fourth oscillating circuit is respectively connected with the first end of the fourth capacitor and the first end of the fifth oscillating circuit;
the second end of the fifth oscillating circuit is connected with the first end of the fifth capacitor, and the connection node is used as the output end of the filter;
the second end of the first oscillating circuit, the second end of the second oscillating circuit, the second end of the third capacitor, the second end of the fourth capacitor and the second end of the fifth capacitor are grounded.
Preferably, in the above filter, the filter further includes:
an impedance matching unit located between the input of the filter and the first end of the first acoustic resonator.
Preferably, in the above filter, the impedance matching unit is a first inductor;
the first end of the first inductor is used as an input end of the filter, and the second end of the first inductor is connected with the first end of the first acoustic resonator.
Preferably, in the above filter, the first tank is configured to form a transmission zero in a first preset frequency band;
the second oscillation circuit is used for forming a transmission zero point in a second preset frequency band;
the third oscillation circuit is used for forming a transmission zero point at 5.17GHz-5.835 GHz;
the fourth oscillation circuit is used for forming a transmission zero point at 5.925GHz-7.125 GHz;
the fifth oscillation circuit is used for forming a transmission zero point between 5.925GHz and 7.125 GHz.
Preferably, in the above filter, the series resonance frequency of the first acoustic resonator and the second acoustic resonator is 4.8GHz-5GHz.
Preferably, in the above filter, the parallel resonance frequency of the first acoustic resonator and the second acoustic resonator is 5.1GHz-5.3GHz.
Preferably, in the above filter, the first tank circuit and the second tank circuit have the same circuit configuration, and the filter includes: inductance and capacitance;
the first end of the inductor is used as the first end of the oscillating circuit, the second end of the inductor is connected with the first end of the capacitor, and the second end of the capacitor is grounded.
Preferably, in the above filter, the third tank circuit, the fourth tank circuit, and the fifth tank circuit have the same circuit configuration, and the filter includes: inductance and capacitance;
the first end of the inductor is connected with the first end of the capacitor, and the connection node is used as the first end of the oscillating circuit;
the second end of the inductor is connected with the second end of the capacitor, and the connection node is used as the second end of the oscillation loop.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a filter for an N79 frequency band, which comprises the following components: at least one acoustic resonator and an IPD filter circuit; the acoustic resonator and the IPD filter circuit are sequentially connected in series, or the acoustic resonator and the IPD filter circuit are connected in series at intervals; the IPD filter circuit is used for forming a passband in an N79 frequency band. The acoustic resonator has a high Q value, can form a fast roll-off when forming a filter, but has a smaller filter bandwidth; the IPD filter circuit has the characteristics of high frequency and large bandwidth, but has slow roll-off and low suppression degree in adjacent frequency bands of the pass band. The filter for the N79 frequency band adopts an acoustic resonator and IPD filter circuit integration technology to realize target requirements, and adopts a semiconductor processing technology to realize processing and manufacturing on the same wafer, and the circuit and the structure of the filter can have the characteristics of large bandwidth and quick roll-off, and can simultaneously realize low insertion loss of the N79 frequency band and high inhibition of WiFi 6E.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic circuit diagram of a filter for an N79 frequency band according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a second embodiment of a filter for N79 frequency band;
FIG. 3 is a schematic diagram of a third embodiment of a filter for an N79 band;
FIG. 4 is a schematic diagram of a circuit structure of a filter for an N79 frequency band according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of another circuit structure of a filter for N79 frequency band according to an embodiment of the present invention;
fig. 6 is a frequency characteristic curve of a first acoustic resonator and a second acoustic resonator according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a filter for an N79 frequency band according to an embodiment of the present invention;
fig. 8 is an enlarged partial schematic view of fig. 7.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Based on the description of the background technology, the embodiment of the invention provides a filter for an N79 frequency band, in particular provides a filter coexisting with WiFi 6E for the N79 frequency band, the target requirements are met by adopting a passive integrated device (Integrated Passive Devices, abbreviated as IPD) and an acoustic resonator integration technology, the passive integrated device and the acoustic resonator integration technology are manufactured on the same wafer by adopting a semiconductor processing technology, the circuit and the structure of the filter can have the characteristics of large bandwidth and rapid roll-off, and the low insertion loss of the N79 frequency band and the high suppression of the WiFi 6E can be simultaneously realized.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1, fig. 1 is a schematic circuit diagram of a filter for an N79 frequency band according to an embodiment of the present invention, referring to fig. 2, fig. 2 is a schematic circuit diagram of a second filter for an N79 frequency band according to an embodiment of the present invention, referring to fig. 3, and fig. 3 is a schematic circuit diagram of a third filter for an N79 frequency band according to an embodiment of the present invention.
The filter for the N79 frequency band provided by the embodiment of the application comprises: at least one acoustic resonator Res and an IPD filter circuit 11.
Wherein the acoustic resonator Res and the IPD filter circuit 11 are sequentially connected in series, or the acoustic resonator Res and the IPD filter circuit 11 are connected in series at intervals.
The IPD filter circuit 11 is configured to form a passband in the N79 frequency band.
Specifically, in this embodiment, as shown in fig. 1, the filter includes an acoustic resonator Res and an IPD filter circuit 11, which are sequentially connected in series; the filter comprises two acoustic resonators Res and an IPD filter circuit 11 as shown in fig. 2, which are connected in series at intervals; the filter comprises two IPD filter circuits 11 and one acoustic resonator Res, which are also connected in series at intervals as shown in fig. 3.
Wherein the acoustic resonator Res has a high Q value, and can form a fast roll-off when forming a filter, but the bandwidth of the filter formed by the acoustic resonator Res is smaller; the IPD filter circuit 11 has a high frequency and a large bandwidth, but has a low roll-off and a low suppression level in the adjacent frequency band of the passband.
As shown in fig. 1-3, the acoustic resonator Res and the IPD filter circuit 11 are connected by a specific circuit, which can achieve both advantages. The connection relationship between the IPD filter circuit 11 and the acoustic resonator Res may be serial connection or spaced connection.
Among them, acoustic resonators Res include, but are not limited to, surface wave resonators (SAW), bulk acoustic wave resonators (BAW), film Bulk Acoustic Resonators (FBAR), solid Mount Resonators (SMR), lamb Wave Resonators (LWR), and the like.
Optionally, in another embodiment of the present invention, referring to fig. 4, fig. 4 is a schematic circuit diagram of a filter for an N79 frequency band provided In an embodiment of the present invention, where the acoustic resonator Res includes a first acoustic resonator Res1 and a second acoustic resonator Res2, a first end of the first acoustic resonator Res1 is used as an input end In of the filter, and a second end of the first acoustic resonator Res1 is connected to a first end of the second acoustic resonator Res 2.
The IPD filter circuit 11 includes: the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the first tank LCT1, the second tank LCT2, the third tank LCT3, the fourth tank LCT4 and the fifth tank LCT5.
The second end of the second acoustic resonator Res2 is connected to the first end of the first capacitor C1 and the first end of the first tank LCT1, respectively.
The second end of the first capacitor C1 is connected to the first end of the second capacitor C2, and the connection node is connected to the first end of the second tank LCT 2.
The second end of the second capacitor C2 is connected to the first end of the third tank LCT 3.
The second end of the third tank LCT3 is connected to the first end of the third capacitor C3 and the first end of the fourth tank LCT4, respectively.
The second end of the fourth tank LCT4 is connected to the first end of the fourth capacitor C4 and the first end of the fifth tank LCT5, respectively.
The second end of the fifth oscillating circuit LCT5 is connected to the first end of the fifth capacitor C5, and the connection node is used as the output end Out of the filter.
The second end of the first tank LCT1, the second end of the second tank LCT2, the second end of the third capacitor C3, the second end of the fourth capacitor C4, and the second end of the fifth capacitor C5 are grounded.
Specifically, in this embodiment, as shown in fig. 4, other elements except the first acoustic resonator Res1 and the second acoustic resonator Res2 together form an IPD filter circuit 11, and a passband is formed in the N79 frequency band (4.4 GHz-5 GHz), and a matching network may also be formed.
The series resonance frequency (fs) of the first acoustic resonator Res1 and the second acoustic resonator Res2 is 4.8GHz-5GHz, that is to say the series resonance frequency (fs) of the first acoustic resonator Res1 and the second acoustic resonator Res2 is around 5 GHz; the parallel resonant frequency (fp) of the first acoustic resonator Res1 and the second acoustic resonator Res2 is 5.1GHz-5.3GHz, that is, the parallel resonant frequency (fp) of the first acoustic resonator Res1 and the second acoustic resonator Res2 is around 5.17GHz, so that the insertion loss of the passband can be improved, and the suppression degree in the 5GHz frequency band (5.17 GHz-5.835 GHz) in the WiFi 6E can be improved.
As shown in fig. 4, the first capacitor C1 and the second capacitor C2 form a high-pass filter sub-circuit, and the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 form a low-pass filter sub-circuit, which together form a passband of the N79 frequency band.
Referring to fig. 5, fig. 5 is a schematic diagram of a circuit structure of another filter for an N79 frequency band according to an embodiment of the present invention, where the circuit structures of the first tank LCT1 and the second tank LCT2 are the same, and the method includes: an inductance L and a capacitance C.
The first end of the inductor L is used as the first end of the oscillating circuit, the second end of the inductor L is connected with the first end of the capacitor C, and the second end of the capacitor C is grounded.
The third tank LCT3, the fourth tank LCT4 and the fifth tank LCT5 have the same circuit structure, and include: an inductance L and a capacitance C.
The first end of the inductance L is connected with the first end of the capacitor C, and the connection node is used as the first end of the oscillating circuit.
The second end of the inductance L is connected with the second end of the capacitor C, and the connection node is used as the second end of the oscillation loop.
That is, the tank circuit in the embodiment of the present application is an lc tank circuit to form a required transmission zero point, thereby increasing the suppression degree at a specific frequency.
Specifically, the first tank LCT1 is configured to form a transmission zero point in a first preset frequency band, for example, the first tank LCT1 forms a transmission zero point near 2GHz, and by means of the characteristics of the high-pass-resistance low-frequency signals of the first capacitor C1 and the second capacitor C2, the signals near 2GHz and below 2GHz can be suppressed by the first capacitor C1, the second capacitor C2 and the first tank LCT1, for example, the frequency bands N1, N2 and 2.4GHz wifi used for part of mobile communications, and the like.
The second tank LCT2 is configured to form a transmission zero in a second preset frequency band, for example, the second tank LCT2 forms a transmission zero near 3.5GHz, and the first capacitor C1, the second capacitor C2, and the second tank LCT2 enable signals near 3.5GHz and below 3.5GHz to be suppressed, for example, a part of the frequency bands N77, N78 used for mobile communications, and so on.
The third tank LCT3 is configured to form a transmission zero point at 5.17GHz-5.835GHz, that is, the third tank LCT3 forms a transmission zero point near 5.5GHz, and forms three transmission zero points together with parallel resonance frequency points of the first acoustic resonator Res1 and the second acoustic resonator Res2, so as to jointly suppress signals in the range of 5.17GHz-5.835 GHz.
The fourth oscillating circuit LCT4 is configured to form a transmission zero point at 5.925GHz-7.125GHz, and the fifth oscillating circuit LCT5 is configured to form a transmission zero point at 5.925GHz-7.125GHz, that is, the fourth oscillating circuit LCT4 and the fifth oscillating circuit LCT5 form two transmission zero points, so as to jointly suppress signals of 5.925GHz-7.125GHz in WiFi 6E.
Optionally, in another embodiment of the present invention, as shown in fig. 5, the filter further includes:
an impedance matching unit located between the input In of the filter and the first end of the first acoustic resonator Res 1.
The impedance matching unit is a first inductor L1.
The first end of the first inductor L1 is used as an input end In of the filter, and the second end of the first inductor L1 is connected with the first end of the first acoustic resonator Res 1.
Specifically, in this embodiment, the impedance matching unit is used for impedance matching, and is used for improving the return loss of the input terminal In of the filter.
Further, referring to fig. 6, fig. 6 is a frequency characteristic curve of a first acoustic resonator and a second acoustic resonator provided in an embodiment of the present invention, it can be known that a series resonance frequency (fs) of the first acoustic resonator Res1 and the second acoustic resonator Res2 is around 5GHz, for improving passband loss; the parallel resonant frequency (fp) of the first acoustic resonator Res1 and the second acoustic resonator Res2 is around 5.17GHz for rapid formation of suppression at 5.17 GHz.
Further, referring to fig. 7, fig. 7 is a schematic performance diagram of a filter for an N79 frequency band according to an embodiment of the present invention, and it is known that the filter for an N79 frequency band according to the embodiment of the present invention is between N79 passband (4.4 GHz-5 GHz), the insertion loss is minimum at 5GHz, and can reach-2.55 dB, and the insertion loss can reach-1.54 dB at the highest in the passband. Meanwhile, the filter for the N79 frequency band provided by the embodiment of the invention has higher inhibition in the 2.4GHz frequency band, the 5GHz frequency band and the 6GHz frequency band of the WiFi 6E, and realizes coexistence of the N79 and the WiFi 6E.
Further, referring to fig. 8, fig. 8 is a partially enlarged schematic diagram of fig. 7, and it can be seen that the suppression degree can also reach 30dB in the 5GHz band immediately adjacent to the N79 band.
It should be noted that, the acoustic resonator Res and the IPD filter circuit 11 in the embodiment of the present invention may be fabricated on the same wafer, or may be fabricated separately and then packaged in the same chip.
The above describes a filter for the N79 frequency band provided by the present invention in detail, and specific examples are applied herein to illustrate the principles and embodiments of the present invention, and the above examples are only used to help understand the method and core ideas of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include, or is intended to include, elements inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A filter for an N79 frequency band, the filter comprising: at least one acoustic resonator and an IPD filter circuit;
the acoustic resonator and the IPD filter circuit are sequentially connected in series, or the acoustic resonator and the IPD filter circuit are connected in series at intervals, and the IPD filter circuit is used for forming a passband in an N79 frequency band so that the filter for the N79 frequency band can simultaneously realize low insertion loss of the N79 frequency band and high suppression of WiFi 6E;
the acoustic resonator comprises a first acoustic resonator and a second acoustic resonator, wherein a first end of the first acoustic resonator is used as an input end of the filter, and a second end of the first acoustic resonator is connected with a first end of the second acoustic resonator;
the IPD filter circuit includes: the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the first oscillating circuit, the second oscillating circuit, the third oscillating circuit, the fourth oscillating circuit and the fifth oscillating circuit;
the second end of the second acoustic resonator is respectively connected with the first end of the first capacitor and the first end of the first oscillation circuit;
the second end of the first capacitor is connected with the first end of the second capacitor, and the connecting node is connected with the first end of the second oscillating circuit;
the second end of the second capacitor is connected with the first end of the third oscillating circuit;
the second end of the third oscillating circuit is respectively connected with the first end of the third capacitor and the first end of the fourth oscillating circuit;
the second end of the fourth oscillating circuit is respectively connected with the first end of the fourth capacitor and the first end of the fifth oscillating circuit;
the second end of the fifth oscillating circuit is connected with the first end of the fifth capacitor, and the connection node is used as the output end of the filter;
the second end of the first oscillating circuit, the second end of the second oscillating circuit, the second end of the third capacitor, the second end of the fourth capacitor and the second end of the fifth capacitor are grounded.
2. The filter of claim 1, wherein the acoustic resonator comprises: surface wave resonators, bulk acoustic wave resonators, thin film bulk acoustic wave resonators, solid mount resonators or lamb wave resonators.
3. The filter of claim 1, wherein the filter further comprises:
an impedance matching unit located between the input of the filter and the first end of the first acoustic resonator.
4. A filter according to claim 3, wherein the impedance matching unit is a first inductance;
the first end of the first inductor is used as an input end of the filter, and the second end of the first inductor is connected with the first end of the first acoustic resonator.
5. The filter of claim 1, wherein the first tank is configured to form a transmission zero in a first predetermined frequency band;
the second oscillation circuit is used for forming a transmission zero point in a second preset frequency band;
the third oscillation circuit is used for forming a transmission zero point at 5.17GHz-5.835 GHz;
the fourth oscillation circuit is used for forming a transmission zero point at 5.925GHz-7.125 GHz;
the fifth oscillation circuit is used for forming a transmission zero point between 5.925GHz and 7.125 GHz.
6. The filter of claim 1, wherein the series resonant frequency of the first acoustic resonator and the second acoustic resonator is 4.8GHz-5GHz.
7. The filter of claim 1, wherein the parallel resonant frequency of the first acoustic resonator and the second acoustic resonator is 5.1GHz-5.3GHz.
8. The filter according to claim 1, wherein the first tank circuit and the second tank circuit have the same circuit configuration, and comprising: inductance and capacitance;
the first end of the inductor is used as the first end of the oscillating circuit, the second end of the inductor is connected with the first end of the capacitor, and the second end of the capacitor is grounded.
9. The filter according to claim 1, wherein the third tank circuit, the fourth tank circuit, and the fifth tank circuit have the same circuit configuration, comprising: inductance and capacitance;
the first end of the inductor is connected with the first end of the capacitor, and the connection node is used as the first end of the oscillating circuit;
the second end of the inductor is connected with the second end of the capacitor, and the connection node is used as the second end of the oscillation loop.
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